Protocols Click the links below to learn more about protocols from the Helmrath Lab: In Vivo Model of Small Intestine Establishment of murine gastrointestinal epithelial organoids Establishment of human enteroids from biopsies and surgical samples in vivo Fluorescein Isothiocyanate-dextran (FD4) permeability assay Intravenous tomato lectin injection to assess functional vasculature